FRIDAY LUNCHTIMEIn a room of 100 people, the noisy sounds of lunch hush as the clinician leader, a wiry young oncologist, opens the 70th Schwartz Center Rounds with a topical joke, a brief announcement, and a welcoming smile. He starts in earnest, leaning slightly forward, and introduces a senior Massachusetts General Hospital (MGH) physician and the story he will tell with, "We often ask ourselves, 'what would I do if I got cancer?' " A pediatrician is the colleague who has cancer. He shifts Correspondence: Richard T. Penson, M.R.C.P., M.D.,